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GAURAV KUMAR

· started a discussion

· 1 Months ago

answer can be anyone sin0/2 or cos0/2 (Question: 221500.0 )

the thing under square root will be written as square and then its square root is taken that can be positive or negative both. so the ans can be any of them

Question:
If \(\theta\) = 60°, \(\cfrac{1}{2} \ \sqrt{1 + sin \ \theta} + \cfrac{1}{2}\ \sqrt{1 - sin \ \theta} \)    then  is equal to - 
Options:
A) cot \(\cfrac{\theta}{2}\)
B) sec \(\cfrac{\theta}{2}\)
C) sin \(\cfrac{\theta}{2}\)
D) cos \(\cfrac{\theta}{2}\)
Solution:
Ans: (d)

Just apply the trigonometric formula:
1+sinx = [sinx/2 + cosx/2]^2

Now,


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